hoffman



Oct. 16; 1934. R, Q HOFFMAN I 1,976,883

v FURNACE Filed. June 26, 1933 2 Sheets-Sheet 2 Patented Oct. 16, 1934 f'f o reo stare FURNACE 7 Raymond G. Hoffman, Vineland, N. J. Application June 26, 1933, Serial No. 677,704 3 Claims. lCl. 126-170) The invention relates to furnaces of the coal burning type, and has for its object to provide a device of this character comprising a toothed 7 base grate having rotatably mounted on the upper *5 side thereofan apertured frustoconically shaped grate supporting an upwardly extending dome adapted to form an air shaft whereby air will be furnished to the bodyof coal within the fire box for insuring a uniform combustion.

A further object is to provide the frustoconically shaped grate and members forming the dome with axially disposed rectangular sleeves in which is mounted a vertically disposed-rectangularly shaped shaftadapted to be rotated for a shaking operation.

A further object is to provide the upper end of the rectangularly shaped shaft with an angular portion adapted to receive the end of a shaking tool which may be placed on the shaft through the 211 furnace door opening.

A further object is to provide the vanes of the rectangular portion in the frustoconically shaped grate with circumferentially arranged notches in which an annular flange carried by the base grate is disposed, thereby forming a bearing for supporting the frustoconically shaped grate and the dome during the partial rotations thereof during a shaking operation.

A further object is to form the dome from a cylindrical section, the lower end of which is received within an annular flange carried by the frustoconically shaped grate and a top section having its lower side notched to form air passages adjacent the upper end of the device.

In the drawings:

Figure l is a vertical transverse sectional view through a conventional form of furnace showing the improved grate therein.

Figure 2 is a vertical transverse sectional View 2 ,1 through the grate.

. of a type wherein there is a fire box opening 4 of conventional form.

The improved grate comprises a base section 5, on which is disposed an upwardly extending frustoconically shaped section 6 and a dome section 7, all supported within the fire box on the grate flange 8. The base grate section 5 is formed fromsegmentalsections5aand5bhaving scalloped connections at 8a so that the grate can be placed within the flre box 1 in sections. The sections 5a and 5b are preferably secured together by means 6%. of bolts 9. The lower grate section 5 is provided with a horizontal web 10 having an upwardly extending annular flange l1, surrounding a central boss 12, which forms a bearing on which the grate section 6 rotates during a shaking operation, cone5, sequently forming a relatively wide bearing. The lower grate section 5. is provided with inclined ribs 13 circumferentially arranged, and which ribs cooperate with the radial lugs 14 of the grate section 6 and the downwardly extending teeth 15 of the section 6 during a shaking operation; the parts cooperating as a mill to break up clinkers before they pass to the ash pit, and at the same time insuring utilization of all of the fuel. The grate is particularly adapted for use with small size coal, for instance pea coal or buckwheat coal, however applicant does not limit himself in this particular.

Grate section 6 is provided with a plurality of holes 16, which allow freedom of circulation of air 30; to the coal in the fire box 1, and also is provided with a rectangular shaped sleeve 17 vertically disposed within the member 6, and connected to the member by vanes 18. The lower ends of the vanes 18 are provided with cii'curnferentially ar- 35* ranged notches 19 which receive the annular flange 11 on the bearing member 12, therefore it will be seen that the member 6 is held against lateral displacement during a shaking operation, and at which time the grate is partially rotated on a bearing 12. Extending vertically through the sleeve 17 is a rectangularly shaped shaft 20, the lower end of which terminates in a round portion 21, rotatably mounted in the bearing 22 of the base section 5 of the grate. Shaft 20 ex- 95. tending vertically through the fire box, has its upper end provided with a rectangular shaped portion 23 adapted to receive the end 24 of a shaker handle 25 which extends through the furnace door opening 4, and is removable. When the operator desires to shake the furnace, the handle 25 is passed through the door 4 and placed on the shaft.

The dome section 7 comprises a lower cylindrical portion 7a and an upper dome section 7?). Portion 7a is received on the upper end of the grate section 6 within the annular flange 26 and rotates with the section 6. Disposed within the section To is a rectangular sleeve 2'7 having vane connections 28 with the section 7a and through which the rectangular shaft 20 extends, therefore it will be seen that this portion of the dome 7 will rotate with the grate section 7 as it is oscillated. The upper dome section 7a is mounted on the shaft 20 and has an integral sleeve 29 therein rectangularly shaped and through which shaft 20 extends. 1 i

The lower end of the dome section '71) has a channel connection 30 with the upper end of the section 7a and is provided with circumferentially arranged notches 31 forming air passages to the body of the coal adjacent the upper side thereof, whereby it will be seen that air is supplied to the coal adjacent the upper side of the bed for increasing the combustion thereof.

From the above it will be seen that a furnace grate is provided which is particularly adapted for use where small size coal is used. It will also be seen that by providing the grate and dome with vertical passages, there will be a free circulation of air upwardly to the body of coal through the apertures 16 as well as through the air passages 31, and also through the lower grate 5, around the member 6, consequently a more perfect combustion is accomplished.

The invention having been set forth what is claimed as new and useful is:

1. A furnace fire box grate comprising a base member, a frustoconically shaped grate section rotatably mounted on said base member, an apertured dome supported on said frustoconically shaped section, a shaft rotatably mounted in the base member and extending through said frustoconically shaped grate member and dome, means connected to the upper end of the shaft above the dome and forming means whereby said frustoconically shaped grate member and dome may be partially rotated, axially disposed sleeves within the frustoconically shaped section and the dome section and through which the shaft extends, vanes carried by said sleeves and connecting the sleeves to the frustoconically shaped member and the dome, said sleeves and shaft being connected together whereby they will rotate together, the sleeve of the frustoconically shaped member having bearing engagement with the base member.

2. A grate comprising a base member, a frustoconical apertured grate section rotatably mounted on the base member, an apertured dome section carried by the frustoconical section, angular shaped sleeves carried by the dome and frustoconical section in axial alinement, a rotatable shaft extending through said sleeve and conforming to the shape thereof whereby the dome and frustoconically shaped sections will rotate therewith, said sleeves being connected to the dome and frustoconically shaped section by vanes.

3. A furnace grate comprising a base section, 100 superimposed sections mounted on the base section and rotatable thereon, a bearing connection between one of the superimposed sections and the base section, said bearing connection comprising an annular flange carried by the base section, 105 vanes carried by one of the superimposed sections, said vanes having notches therein in which the annular flange is disposed.

' RAYMOND O. HOFFMAN. 

